Merge branch 'kill-dos' into 'next'

Doxyfile

bin/Dos/Debug/.gitignore

bin/Dos/Release/.gitignore

objs/djgppdos/Debug/.gitignore

objs/djgppdos/Release/.gitignore

src/Makefile

src/Makefile.cfg

src/console.c

src/d_main.c

src/dehacked.c

src/djgppdos/Makefile.cfg

src/djgppdos/bcd.c

src/djgppdos/bcd.h

src/djgppdos/i_cdmus.c

src/djgppdos/i_main.c

src/djgppdos/i_net.c

src/djgppdos/i_sound.c

src/djgppdos/i_system.c

src/djgppdos/i_video.c

src/djgppdos/internal.h